The following partial information is taken from the comparative balance sheet of Levi Corporation: 12/31/2015 Shareholders' equity Common stock, $5 par value; 20 million shares authorized and 9 million shares issued $45 million 392 million Additional paid-in capital on common stock 157 million Retained earnings (50 million) Treasury common stock, at cost, 4 million shares. $544 million Total shareholders' equity How many of Levi's common shares were outstanding on 12/31/2015